51 cards
pwd, ls, and cd. The cards also cover everyday file management tasks such as creating, copying, moving, and removing files and directories, along with simple ways to peek inside files using tools like cat, less, and head.
It's a great starting point if you're completely new to Linux, transitioning from a graphical interface, or preparing for coursework, certifications, or entry-level roles in IT, development, or data work. Even a little command-line confidence can make you noticeably faster and more comfortable on any Unix-like system, from a Raspberry Pi to a cloud server.
To get the most out of these cards, try to follow along on a real Linux machine or a virtual terminal as you study, since hands-on practice cements commands far better than reading alone. Review a small batch of cards each day rather than cramming, and challenge yourself to complete one tiny task at the command line between sessions, like making a folder or inspecting a file. Repetition over time, combined with real use, is what turns memorized commands into genuine fluency.